CN-122016297-A - Dynamic evaluation method and device for performance of transformer sleeve sealing ring

CN122016297ACN 122016297 ACN122016297 ACN 122016297ACN-122016297-A

Abstract

The invention discloses a dynamic evaluation method and device for performance of a transformer sleeve sealing ring, and relates to the technical field of detection of sealing performance of power equipment. The invention simulates the multiaxial vibration environment in actual operation, comprehensively monitors the change of the displacement quantity and the leakage rate of the sealing ring, calculates the dynamic sealing performance parameter based on the initial moment and the displacement quantity and the leakage rate after the vibration mode in actual operation is simulated for a preset time, and accurately evaluates the performance attenuation degree of the sealing ring under the dynamic vibration condition by utilizing the dynamic sealing performance parameter.

Inventors

YIN FANGHUI
LI HUIJIE

Assignees

清华大学深圳国际研究生院

Dates

Publication Date: 20260512
Application Date: 20260414

Claims (9)

1. The dynamic evaluation method for the performance of the transformer bushing sealing ring is characterized by comprising the following steps of: s1, applying multiaxial vibration excitation to a sealing ring tool provided with a sealing ring; S2, monitoring the displacement of the sealing ring in the vibration process; s3, monitoring the leakage rate of the sealing ring tool in the vibration process; s4, controlling the vibration test bed to run for a preset time in a preset vibration mode, and acquiring an initial moment, and a displacement and a leakage rate after running for the preset time; and S5, calculating the dynamic sealing performance parameter of the sealing ring based on the initial moment and the displacement and leakage rate after running for a preset time, wherein the dynamic sealing performance parameter is used for evaluating the performance attenuation degree of the sealing ring under the dynamic vibration condition.
2. The method of claim 1, wherein the vibration direction of the vibration excitation applied by the vibration test stand comprises at least one direction of X, Y, Z axes.
3. The method for dynamically evaluating the performance of a transformer bushing sealing ring according to claim 1, wherein the waveform of vibration excitation applied by the vibration test bed is a sine wave or a random wave.
4. The method of claim 1, wherein the predetermined vibration modes include one or more of fixed frequency, swept frequency, random vibration, or double frequency vibration.
5. The dynamic evaluation method for the performance of the transformer bushing sealing ring according to claim 1, wherein in step S2, the displacement of the sealing ring during vibration is monitored by a displacement monitoring device, and the displacement monitoring device comprises a high-speed camera.
6. The dynamic evaluation method of performance of a transformer bushing sealing ring according to claim 1, wherein in step S5, a formula for calculating a dynamic sealing performance parameter of the sealing ring is: ; where t is a predetermined length of time for vibration mode operation, In order to be a dynamic sealing performance parameter, For the leak rate at the initial moment, As the displacement amount at the initial time, The leak rate at the time t is the leak rate, The displacement at time t.
7. A dynamic evaluation device for performance of a transformer bushing gasket for implementing the dynamic evaluation method for performance of a transformer bushing gasket according to any one of claims 1 to 6, comprising: The vibration test stand is used for providing multiaxial vibration excitation and comprises an upper cover and a bottom plate; the sealing ring tool is used for installing a sealing ring to be tested and forming a closed air cavity and comprises a bottom plate and an upper cover arranged on the bottom plate; a fixing jig including an upper jig for fixing the upper cover to the base plate and a lower jig for connecting the base plate to the upper cover; The air tightness detection device is communicated with the air cavity and is used for monitoring the leakage rate; the displacement monitoring device is used for monitoring the displacement of the sealing ring; the control module is in communication connection with the vibration test table, the air tightness detection device and the displacement monitoring device, and is configured to: Controlling the vibration test bed to run in a preset mode; and acquiring leakage rate and displacement data after the operation of the initial moment and the vibration mode for a preset time from the air tightness detection device and the displacement monitoring device, and calculating the dynamic sealing performance parameters.
8. The dynamic evaluation device for performance of a transformer bushing sealing ring according to claim 7, wherein a bottom plate of the sealing ring tool is provided with a groove for accommodating the sealing ring, and the upper cover is of a convex design and is matched with the bottom plate to form the closed air cavity.
9. The utility model provides a transformer bushing sealing washer health state early warning system which characterized in that includes: The dynamic evaluation device for performance of a transformer bushing sealing ring according to claim 7 or 8, wherein the dynamic evaluation device is used for acquiring dynamic sealing performance parameters of the sealing ring; The early warning module is in communication connection with the dynamic evaluation device of the performance of the transformer sleeve sealing ring, and is configured to compare the dynamic sealing performance parameter with a preset threshold value and send out an early warning signal according to a comparison result.

Description

Dynamic evaluation method and device for performance of transformer sleeve sealing ring Technical Field The invention relates to the technical field of detection of sealing performance of power equipment, in particular to a dynamic evaluation method and device for performance of a transformer sleeve sealing ring and application of the dynamic evaluation method and device. Background The transformer bushing is used as an important component of the transformer, and the sealing performance of the transformer bushing directly influences the safe operation of the transformer. In actual operation, the transformer bushing sealing ring bears complex multiaxial mechanical vibrations, including vibration stresses caused by transformer body vibrations, short-circuit electrodynamic forces, wind loads, and the like. The dynamic stresses can lead to fatigue wear and permanent deformation of the sealing ring, further lead to attenuation of sealing performance, lead to faults such as oil seepage and oil leakage, and even lead to fire and explosion accidents. At present, the detection of the transformer bushing sealing ring mainly focuses on static sealing performance test and sealing ring material performance test, such as compression set rate, hardness, tensile property and the like. The static test methods cannot simulate the dynamic vibration environment in actual operation, and are difficult to accurately evaluate the performance attenuation condition of the sealing ring under the action of long-term dynamic stress. The conventional vibration test bed is mainly used for testing the durability of a sealing ring or a transformer sleeve, and lacks a dynamic evaluation device and method for the sealing performance of the sealing ring in a vibration environment. Therefore, it is necessary to develop a test method and device capable of simulating the actual dynamic conditions and comprehensively evaluating the performance attenuation of the sealing ring. Disclosure of Invention In view of the above, the invention aims to solve the technical problems of accurately evaluating the performance attenuation degree of the transformer sleeve sealing ring under the dynamic vibration condition and overcoming the limitation that the existing static test method cannot simulate the actual dynamic working condition. The invention provides a dynamic evaluation method for performance of a transformer sleeve sealing ring, which comprises the following steps of S1, applying multiaxial vibration excitation to a sealing ring tool provided with a sealing ring, S2, monitoring displacement of the sealing ring in a vibration process, S3, monitoring leakage rate of the sealing ring tool in the vibration process, S4, controlling a vibration test bench to operate in a preset vibration mode for a preset time period, obtaining initial time and displacement and leakage rate after the preset time period, and S5, calculating to obtain dynamic sealing performance parameters of the sealing ring based on the initial time and the displacement and the leakage rate after the preset time period, wherein the dynamic sealing performance parameters are used for evaluating performance attenuation degree of the sealing ring under a dynamic vibration condition. Optionally, the vibration direction of the vibration stimulus applied by the vibration test stand includes at least one direction of the X, Y, Z axes. Alternatively, the waveform of the vibration excitation applied by the vibration test bed is a sine wave or a random wave. Optionally, the preset vibration modes include one or more of fixed frequency, swept frequency, random vibration, or double frequency vibration. Optionally, in step S2, the displacement of the seal ring during vibration is monitored by a displacement monitoring device, where the displacement monitoring device includes a high-speed camera. Optionally, in step S5, the formula for calculating the dynamic sealing performance parameter of the sealing ring is: ; where t is a predetermined length of time for vibration mode operation, In order to be a dynamic sealing performance parameter,For the leak rate at the initial moment,As the displacement amount at the initial time,The leak rate at the time t is the leak rate,The displacement at time t. On the other hand, the invention provides a transformer bushing sealing ring performance dynamic assessment device for realizing the transformer bushing sealing ring performance dynamic assessment method, which comprises a vibration test bed, a sealing ring tool, a fixing clamp, an air tightness detection device, a displacement monitoring device and a control module, wherein the vibration test bed is used for providing multiaxial vibration excitation and comprises an upper cover and a bottom plate, the sealing ring tool is used for installing a sealing ring to be tested and forming a closed air cavity and comprises the bottom plate and the upper cover arranged on the bottom plate, the fixing clamp comprises th